Statistical physics and fluctuations in ballistic non-equilibrium systems

✍ Scribed by F.X. Alvarez; D. Jou

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 384 KB
• Volume: 388
• Category: Article
• ISSN: 0378-4371
• DOI: 10.1016/j.physa.2009.02.030

✦ Synopsis

In nonequilibrium systems in the ballistic transport regime, every point of the system contains particles arriving from different regions -each of them at different temperatures -and there are only few collisions, in such a way that equilibrium between the different populations will be reached very slowly. Here, we tentatively approach the local distribution function by a superposition of local-equilibrium distribution functions with different temperatures, corresponding to the different starting positions of the particles. In a second-order expansion, we find a distribution function which depends not only on the Hamiltonian H but also on H 2 , and we study the additional contribution to energy fluctuations.